[mdlug] Static IP behind NAT with Xfinity

[R Kannan]

Hello,

I just subscribed to comcast (did not have many choices unfortunately) 
and got their modem/router (Voice and Data Modem
ARRIS Group, Inc. TG1682G). Their dumbed down setup web application 
seemed to work. The wireless is fine and the wired works with devices 
using DHCP.

But I have a desktop running ubuntu 16.04 using a static IP (for various 
reasons) and when I connected it to the comcast router it did not seem 
to have any connection. Is there something special I need to do for 
devices not requiring IP or the subnet incorrect. I cannot find what 
subnet addresses are being doled out by the router as there is no simple 
web interface like in other modems.

I thought I will ask here before I go up the chain of Comcast unhelpful 
masses.

Any help is appreciated.

Thanks